At the door
Do you not want to accept a parcel, but immediately send it back to the sender? Tell our courier that you refuse the shipment when he is at your door. He then takes it back with him and ensures that it is returned to the sender.
You cannot refuse the shipment before the courier is at your door. If your order is still very recent, you can ask the sender if they can still cancel your order. Has the parcel already been transferred to us by the sender? Then we automatically make a delivery attempt. In that case, refusing at the door is your best option.